L1A1 BFA troubles

[desperatedan]

I've had the below 1959 dated handbook for the L1A1 for a while but never opened it. Looking through it for the first time last night I was surprised (and delighted) to find a Memorandum about the BFA dated 1961 regarding breakages in use and instructions to be applied pending an improved design. Some pics of the memo are attached. Hopefully its legible but as to make it more readable it's pictured in two parts.

Can anyone explain what the design changes were on the "improved" version? Thanks

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